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List of Check Codes (Outdoor Unit)
(Check code detected by outdoor interface - typical examples)
If "HELLO" is displayed on the oudoor 7-segment for 1 minute or more, turn off the power supply once and
then turn on the power supply again after passage of 30 seconds or more. When the same symptom appears,
it is considered there is a possibility of I/F board trouble.
Check code
Outdoor 7-segment display
Sub-code
Number of indoor units from which
E06
signal is received normally
E07
–
E08 Duplicated indoor address
01: Indoor-outdoor communication
E12
02: Outdoor-outdoor
communication
E15
–
00: Capacity over
E16
01: Number of units connected
00: No header unit
E19
02: Two or more header units
01: Connection of outdoor unit from
other refrigerant line
E20
02: Connection of indoor unit from
other refrigerant line
E23
–
E25
–
Address of outdoor unit from which
E26
signal is not received normally
E28
Detected outdoor unit No.
P.C.board
P.C.board
Compressor Fan Motor
Compressor Fan Motor
1
2
1
2
1
01
O
11
O
02
O
12
03
O
O
13
O
E31
08
O
18
09
O
O
19
O
0A
O
O
1A
0B
O
O
O
1B
O
10
O
Circle (O): Trouble P.C. board
80 : Communication trouble between
MCU and Sub MCU
F04
–
F05
–
01: TE1 sensor
02: TE2 sensor
F06
03: TE3 sensor
01: TL1 sensor
02: TL2 sensor
F07
03: TL3 sensor
F08
–
01: TG1 sensor
F0
9
02: TG2 sensor
03: TG3 sensor
Central
control or
Typical problem site
main remote
controller
display
E06
Signal lack of indoor unit
Indoor-outdoor
(E04)
communication circuit
trouble
(E08)
Duplicated indoor address
Automatic address starting
E12
trouble
Indoor unit not found
E15
during automatic address
setting
Too many indoor units
E16
connected/capacity over
Trouble in number of
E19
outdoor header units
Connection to other
refrigerant line found
E20
during automatic address
setting
Outdoor-outdoor
E23
communication
transmission trouble
Duplicated follower
E25
outdoor address
E26
Signal lack of outdoor unit
Outdoor follower unit
E28
trouble
2
1
2
O
P.C. board communication
O
O
trouble
O
O
E31
O
O
Sub MCU
O
O
communication trouble
O
O
O
O
O
O
Outdoor discharge
F04
temperature sensor (TD1)
trouble
Outdoor discharge
F05
temperature sensor (TD2)
trouble
Outdoor heat exchanger
liquid side temperature
F06
sensor (TE1, TE2, TE3)
trouble
Outdoor liquid temperature
sensor (TL1,TL2,TL3)
F07
trouble
Outdoor outside air
F08
temperature sensor (TO)
trouble
Outdoor heat exchanger
gas side temperature
F09
sensor (TG1, TG2, TG3)
trouble
Indoor unit (including Hot Water Module)
Description of problem
• Indoor unit initially communicating normally fails
to return signal (reduction in number of indoor
units connected).
• In TU2C-LINK communication system, if the
termination resistance is not set in any of the
indoor units.
• It is decreasing from the number of HWM
recorded by the outdoor unit.
Signal cannot be transmitted to indoor units
(
indoor units left without communication from
outdoor unit).
More than one indoor unit are assigned same
address (also detected at indoor unit end).
• Indoor automatic address setting is started while
automatic address setting for equipment in other
refrigerant line is in progress.
• Outdoor automatic address setting is started
while automatic address setting for indoor units
is in progress.
Indoor unit fails to communicate while automatic
address setting for indoor units is in progress.
Combined capacity of indoor units is too large.
The maximum combined of indoor units shown in
the specification table.
There is no or more than one outdoor header unit
in one refrigerant line.
Indoor unit from other refrigerant line is detected
while indoor automatic address setting is in
progress.
Signal cannot be transmitted to other outdoor
units.
There is duplication in outdoor addresses set
manually.
Follower outdoor unit initially communicating
normally fails to do so (reduction in number of
follower outdoor units connected).
O
utdoor header unit detects trouble relating to
follower outdoor unit (detail displayed on follower
outdoor unit).
There is no communication between P.C. boards
in inverter box.
Outdoor discharge temperature sensor (TD1) has
been open/short-circuited.
Outdoor discharge temperature sensor (TD2) has
been open/short-circuited.
Outdoor heat exchanger liquid side temperature
sensors (TE1, TE2, TE3) have been open/
short-circuited.
Outdoor liquid temperature sensor (TL1,TL2,TL3)
has been open/short-circuited.
Outdoor outside air temperature sensor (TO) has
been open/short-circuited.
Outdoorheatexchangergas side temperature
sensors (TG1, TG2, TG3) have been open/
short-circuited.
– 48 –
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Troubleshooting
